EMERGENCY LIGHTING DEVICE FOR OPERATING A LIGHT SOURCE, IN PARTICULAR AN LED - An LED driver for operating a light source, in particular an LED, includes an energy storage unit, a driver circuit supplied by the energy storage unit during emergency lighting operation, for operating the light source, and a control unit that activates the driver circuit in such a way that the light source is operated with a constant power or constant current irrespective of the state of charge of the energy storage unit, where the control unit, for the purpose of regulating the power, determines indirectly the level of the current supplied to the light source.

Digital Control Circuit of an Operating Device for Lamps - The invention relates to an integrated digital control circuit for an operating device for lamps, comprising: an output for the pulsing of switches of a half-bridge circuit having an adjustable frequency, wherein a load circuit comprising the lighting devices may be connected to the half-bridge circuit, an input, to which a signal may be selectively supplied, said signal reflecting the current through the half-bridge or the current through the lamp. The input is internally branched into two analysis branches, the outputs of which are combined using a logic member, the output of which is connected in turn to a controller for adjusting the frequency of the half-bridge actuating signal.

Dimmable Operating Device having Internal Dimming Characteristic - The invention relates to an operating device (BG) for lamps (LM), comprising an interface (IFi), by means of which the device (BG) may be provided with external dimming values. The device (BG) converts said provided external dimming values into internal dimming values on the basis of which the control of the connected lamps (LM) is achieved, the internal dimming values being of higher resolution than the external dimming values. According to the invention, the operating device (BG) is designed such that the conversion of the external dimming values into internal dimming values may be programmed. The operating device (BG) can particularly also be designed such that said conversion can be programmed with regard to the dynamics thereof. A programming can be provided by a time conversion relationship (linear, logarithmic or exponential time curve etc.) by means of which an internal dimming value corresponding to an external dimming value is reached.